Why is Validating HTML Code Important for SEO?
SEO FAQ
Testing your web pages in browsers is an absolutely necessary process for building any web page. It allows you to see what others can see, and often you will notice mistakes in your HTML code because of the symptoms they cause in browsers. But what about when your testing browser(s) display the pages exactly as you intended. Are your pages error-free? Not necessarily.
The World Wide Web Consortium (W3C) sets the standards for coding HTML and CSS for web pages. They also provide tools to validate your code for free. So do some third-parties. The question you might be asking is, “if my page looks fine in Internet Explorer, Netscape, Safari, Firefox, etc. why do I need to worry about validation?” If all you’re looking is for proper display, you might not have to at all. However, if you’re concerned at all with Search Engine Optimization (SEO) validating your HTML is a necessity.
One reason for this is the difference between spiders and browsers. Spiders “crawl” the web indexing web pages and their content. They are basically toned-down web browsers that aren’t concerned with displaying for a user but with recognizing content. In other words, Search Engine spiders are looking at the same code your web browsers is and parsing it in a very similar way.
This difference in functionality, however, can be vast. There is a very real pressure on web browser developers to ensure that their browsers display pages correctly to the user. This often includes forgiving what is perceived to be errors in the code. Improperly nested elements, unclosed tags, badly formed tables – these are all errors in HTML code that might not effect your web page’s display in your favorite browser. When it comes to Search Engine spiders, however, it can be an entirely different story.
That is not to say that small errors in your HTML code will spell death for your Search Engine rankings. Certainly they won’t normally make your page invisible to spiders. They can, however, disrupt the vastly important process of a spider parsing your page for all relevant content or make some of that content invisible. And since so much of SEO is paying close attention to every little detail of your site and its content, why leave the possibility open of causing problems for Search Engines when they try to index your pages?
90% of the work we do at SEO France is correcting code in website pages. Many website designers create pages that look good in a browser but overlook the need for valid code. Let us explain a little about the difference between your website looking good in your browser & not so good to search engines.
Browser testing
Testing your web pages in browsers is an absolutely necessary process for building any web page. It allows you to see what others can see, and often you will notice mistakes in your HTML code because of the symptoms they cause in browsers. But what about when your testing browser(s) display the pages exactly as you intended. Are your pages error-free? Not necessarily.
HTML validation
The World Wide Web Consortium (W3C) sets the standards for coding HTML and CSS for web pages. They also provide tools to validate your code for free. So do some third-parties. The question you might be asking is, “if my page looks fine in Internet Explorer, Netscape, Safari, Firefox, etc. why do I need to worry about validation?” If all you’re looking is for proper display, you might not have to at all. However, if you’re concerned with Search Engine Optimisation (SEO) validating your HTML is an absolute must.
Search engine spiders
One reason for this is the difference between spiders and browsers. Spiders “crawl” the web indexing web pages and their content. They are basically stripped-down web browsers that aren’t concerned with displaying for a user but with recognising content. In other words, Search Engine spiders are looking at the same code your web browsers is and parsing it in a very similar way.
This difference in functionality, however, can be vast. There is a very real pressure on web browser developers to ensure that their browsers display pages correctly to the user. This often includes forgiving what is perceived to be errors in the code. Improperly nested elements, unclosed tags, badly formed tables – these are all errors in HTML code that might not effect your web page’s display in your favorite browser. When it comes to Search Engine spiders, however, it can be an entirely different story.
That is not to say that small errors in your HTML code will bury your website in the Search Engine rankings. Certainly they won’t normally make your page invisible to spiders. They can, however, disrupt the vastly important process of a spider parsing your page for all relevant content or make some of that content invisible. The more errors you have in your code the less likely you are of having all of your page or site crawled.